Device for securing conductors to junction-boxes.



M. C. ROSENFELD. DEVICE FOR SECURING GONDUGTORS TO JUNCTION BOXES.

APPLIUATION FILED NOV. 16, 1911.

1,101,963. v Patented June so. 1914.

MORTIMERC. ROSENFELD, O]? CLEVELAND, GHIO.

Specificationof Letters Patent.

DEVICE FOR SECURING COEDUCTQRS TO JUNCTIGN-BOXES.

Patented June 3%,

Application filed November 16, 1911. Serial No 660,651.

2'0 all whom it may concern:

Be it known that I, Momiiinn FELD, & citizen of the Unitedfitates, resident of Cleveland, county of Cuyahoga, and State 5 of Ohio,

movement in Devices for Securing Conduo tors to J unction-Boxes, of which the follow ing is a-speeifiention, the principle of the invention being herein explained and the best mode in which I have contemplutedep plying-that principle, so as to distinguish itfrom other inventions. I

My invention relates to devices for securin'g conductors to junction boxes, its obj et being to provide a device of this character which will lie-economical inits-(-onstr uctionj efficient in its operation, :nd which may be readily attached to a junction box.-

"lhe'said invention consists of means hereinafter fully (1(3S'Clll38tlfllld. particularly set Y forth in the claims.

. Y The annexed drawing and the"following description set forth in detail certain means embodying my means, however,

ciple of the invention may be applied.

In said annexed drawingz-d igure l-is an axial section of a device embodying my in S0 vention, and a fragmentary portion of the Walls of the junction box to which it is attached, a flexible conductor being shown lo: cated therein in dotted lines. Fig. 2 is .a section taken upon the plane indicated by line II-lLof Fig. 1. Fig. 3 is a side elevation of the dev ce embodying my' invention, showing the parts intheir'closed position'. Fig. i is across-section taken upon the lane indicated by line 1V :IV in Fig. 40 3. ig. 5 is a sideelevation, showing the.

parts in their open position. T- 'g. 6 is a cross-section taken upon the lan indicated by line VI-Vlin Fig. 5. ig.-7 is air-end view of the device,

4 same position in which in Fig. 5.- Fig. 8 isnbross-seetional view illustrating .a -modified-forn -of the. inventioin i' -.M,'y invention, as illustrated'by the draw- 0 ings, comprises'two'main' parts-ti sleeve A, and a. locking deviceB mounted thereon as hereinafter described. "The said sleeve is provided with an inner threadedportion a in the usual manner, which projects through 5 an opening '0 formed'in the walls C of the junction box.

C. Rosnxhave invented a new and useful Iniilie axis of the sleeve;

invention, the disclosed, constituting but. one of various mechanical forms in which the prin-.

showing the parts in the th y are illustrated A nut A engages this threaded portion, andahuts the inner surface of the shoulder a Formed integrally on the sleeve 31, seouresmthe sleere firmly to the junction box as .will he read ii uidt-srstood. Uutthroug'h the'ouler end portion oi? the wall or the sleeve ism s id joining at its in ner end with a s mental slot (1? also cut through this end u it portion and ing, in the form of the, invention-illustrated, about one-third the wu 'ound thi: eircun'i- .t l'l o angles -to iferenee oil the sleeve um, i

it will, theretoi'e, be seen that these'slots form it portion u" of the sleeve which may he moved imi'ezidly toward or outwardly fr us the axis of the sleeve thereb forming coiitraetihle sleeve porition. The end the portion (a inn ediately adjacent to the slot torn'ied with a projection extending radially with respect to the-axis of the slug. the outer extremity of this projection lying normally outside or beyond the norm l diameter of the sleeve, as shown in Fig- Parallel withthe'end ot't'he and adjacent thereto, so as to also he termed in the moiuhle portion a", is a groove of, the bottom of which canishaped and part of n l-rich. lies in the pro jeetion of. in this groove, and completely surrounding zthe. sleeve, is seated'the locking device 13, .wl'iich pieiferahiyof hexagonal outer contour.

The inner surface of the locking device or ine'mher B is torn'ied with a cam surface 0,

a" purallel with the wall C,,wherehy it, in conjunction with' which extends spirally with reference to the axis of the sleeve. This cam surface -arrange l-in manner such that when the locking n'ieiuhei' l: rotated or moved inthe direction of the arrow indicated in 6, it will ride upon the pox-thou a, and cause contract the outer end of the sleeve, the opposite movement-after such (iflilii'tiijllOll effecting the opening of such end portion. The balance of the inner suri uee of the nieniheiflli is of circular form, the diameter of suchci *ele heinn slightly greater than the outer diameter of the sleeve i- In assem-' loling the sleeve and the lockingmember 13, the portion a' 'is pressed inwardly by means of any suitable device so as to contract the diameter of this portion ofthe sleeve, and permit the locking device over the end thereof and in the groove a.

n permitted. to lie Where the metal is not to he slipped the same to he moved inwardly so as to. 

